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Richard Dudley -> RE: Anti-spam, anti-spider codes? (9/24/2002 14:04:30)
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There are all sorts of ones out there, but they' re only as good as the spambots are dumb (which means even many of these will cease to work one day).
The only foolproff way is to have people submit a form, and have a back-end script send the message. Another way is to have a small graphic that looks like a text link actuate a script that creates a new mail message. In the absence of that, here are a few colled from recent editions of the bCentral Daily Digest:
1) e-mail cloak http://www.email-cloak.com/default.asp
2) Clean My Mailbox: http://www.cleanmymailbox.com/free.html
3) Disguise your e-mail links: http://www.colmgallagher.com/encode_all.html
4) Spamlib.pl, PERL scripts: http://www.phaget4.org/seidel/CodeMonkey/spamlib.html
Other options discussed were:
Mailwasher, a utility to scrub your messages before you download them. Available at http://www.mailwasher.net/
Bounce Spam Mail, which sends back a fake bounce message, at http://www.pcworld.com/downloads/file_description/0,fid,5402,00.asp
quote:
Create a contact page with all your email addresses coded
normally *and* create a file called robots.txt in the root
directory of your site which contains the lines:
User-agent: *
Disallow: /contacts.htm
This tells automated programs (such as search engine crawlers) to
ignore that page. Email harvesters respect it too, because if they
don' t, they get flooded by fake emails on sites set up by people
who really hate spammers. (Peter Lapinskas, Daily #1414)
and
quote:
However, if you don' t need total protection, just replace some or
all of the characters in the address with the equivalent HTML
character code.
Thus,
myname@nospamplease.com
could become
myname@nospamplease.com
I use this latter technique on my own site and it has been enough
to stop 95% of the spam, yet there is no observable difference for
your visitors -- you have to view the source code to see the changes.
If you are using NoteTab as your HTML editor (and I would recommend
it), there is a free routine to do this at the touch of a button,
called HideEmail ( www.notetab.com/html.htm#Utilities ). (-ibid)
Something else to watch out for:
quote:
Shotgunning Your Daemon Mailer
This has become the most pervasive and common method of hackers to
flood the internet with spam. Many hosting companies now are
inhibiting unprotected versions of formmail.pl.
There are newer versions of formmail that only allow email to
selected addressees and / or from a pre-determined domain server.
Get one! THIS IS VITALLY IMPORTANT!
Not only will you begin protecting yourself, but also your friendly
ISP and your gracious hosting company and... you will reduce the
enormous thievery of hardware, wasted bandwidth and time of every
responsible internet user! (Bill Davison, Daily #1416)
Unfortunately, there is no archive for this digest, but I still have these issues in my deleted items box. E-mail me and I' ll forward them to you.
rich
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